Typewriting machine



Feb. 14, 1933. H: J. HART TYPEWRIT ING MACHI NE Filed April. 13, 1931 m Wm w Passati-r5.5 14, ieee.

UNITED STATES lPATENT OFFICE HENRY J'. HART, OF WEST HARTFORD, CONNECTICUT, ASSIGNOB .T0 ROYAL TYPE- WBITER COMPANY, INC., OF NEW YORK, N. vY., A CORPORATION 0F NEW 'YORK TYPEWItITING MACHINE application mea apra 1s,

This invention relates to new and useful improvements in typewriters generally, although more particularly to the means' for attaching the lower carriage rail to the main frame of the machine.

Heretofore, carriages have beensupported on the main frame for letter space movements through the medium of two rails, the lower one being fixed to the frame and the upper one being fixed to the carriage, and conjointly formed between the rails is a ball race for receiving anti-friction balls respectively disposed within pinions which constantl mesh with longitudinal racks respectively xed to the rails. The lower rail has heretofore been rigidly attached at its ends by clamping bolts to bearing lugs which extend inwardly from the side plates of the main frame. These strated that it is almost impossible to assemble the main frame in a manner which will insure absolute alinement of the bearing surfaces of the lu s, and consequently when the lower rail is c amped to such lugs, the rail will become bowed between its ends, thereby greately reducing the freedom of carriage movement.

Among the severel objects of my invention are to provide oating bearings for the ends of the lower rail wherebysaidrail will aline itself with respect to the bearings and thereby vavoid any distortion inthe rail when clamped to the main frame; to provide means for independently adjusting the; ends of the lower rail in a fore and aft direction, and to' provide means for retaining the side plates of the main frame against either inward or outward movement.

With these and other objects in view which will more fully appear, thenature of the invention will-be more clearly understood by following the description, the appended claims, and the several .views illustrated in the accompanyin drawing, in which:

Figure 1 is a etail elevation of a part of the main frame of a typewriter, and the platen, and embodying my invention;

Figure2 is a top plan view of the, lower 1931. serial no. 529,939.

carriage rail, showing the manner of supportplates of theA main Like reference numerals designate corre` sponding parts throughout the several figures of the drawing.

Referring to the acoompanyin drawing, I have shown my invention em odied in a front strike ty ewriting machine which includes a main rame A, and carriage B and type-C. i

The main frame A includes side plates 5, 5.

which are preferably manufactured lsepal plates are separately manufactured, andthe. upper or bearing surfaces of the lugs are separately machined. Practice has demonrately, and integral with these plates are inwardl' extending bearing lugs 6, 6 which support, t e upper and lower carriage rails 7 and 8, the upper rail being fixed to the carriage in the usual manner. lA lurality of antifrition balls 9 are dispose in a race conjointl formed in the rails, and surrounding eachba is a pinion 10 which is in constant mesh vwith racks 11 and 12 extendin alon the rails.

Formed on the underside of t e lower rail 8 at each end thereof is-a transversely extending bearing seat including upwardly and inwardly converging flat side walls 13, 13 for receiving a floating bearing blockv 14 which is freely seated upon the upper flat surface 15 of the adjacent bearing lug 6. The block 14 is formed with a ilat lower bearin surface 16 and with a transversely rounde upper surface 17 which ts within the bearing seat and has' line contacts with the inclined walls 13, 13 thereof. The threaded shank of a clamping bolt 18 extends upwardly through a vertical opening 19 formed in t e lu 6, and thence through alined-o nings 20 an 21 formed in the block 14 an lower rail 8 respectively, the opening 21 in the rail being threaded and the openings 19 and 20 in the lug 6 and block 14 each havlng a diameter ater than the diameter of the bolt shank.

en attaching the lower rail 8 to the side plates of the main frame, the bearing blocks v14, 14: are positioned upon the lugs 6, 6, and

the lower rail is then positioned whereby the blocks 14 will enter the bearing recesses The clamping bolts are then projected through the openings 19 of the lugs 6 and the o nings 20 of the blocks 14, and are then tlieadedly engaged in the openings 21 of the lower rail 8. During this assembling operation, the floating bearing blocks 14 will center themselves in the bearing recesses w, and the side walls 13, 13 of each recess will have a two point line contact with the associated bearing block 14, thus assuring self alining of the ends of the lower rail and thereby avoiding any bending or flexing of the rail when the clamping bolts 18 are tightened.

At the outer side of each bearing the lower rail is formed with an upwardly extendin transverse slot 22 which receives the head o a screw 23 threaded into the adacent side plate of the main frame. The wi th of the groove corre onds to the diameter of the screw head an therefore the side plates are lretained against either inward or outward movement, yet permitting the lower rail to be adjusted in a ore and aft direction.

For the pur ose of independently adjusting the ends o the lower rail 8 in a fore and aft direction for rin and cylinder adjustment, the rail is provided with vertical lugs 24, 24 which depend from the rail and are located between the lu 6, 6. Associated with each lug 24 is an adjusting screw 25, having a shank 26 which is threaded into the lugs 24, 24 and having a head 27 which procts into a slot 28 formed inthe adjacent bearing lu 6. By turning the head 27 the screw willie rotated but will not be moved fore and aft, and consequently the adjacent end of the lower rail may be readily adjusted 40 in a fore and aft direction after first loosenin the clam ing bolt 18.

rom the oregoin it will be apparent that I have provided sel alining bearmg for the lower rail means for independently adjusting the ends of the lower ra1l in a fore and aft direction relative to the main frame, and means for retaining the side plates of the main frame against lateral movements relative to the lower rail in any position of adj'ustment of the latter.

I claim:

1. In a typewriter, the combination with a main frame, of means for supporting a carriage on said frame for letter space movements including up r and lower rails, means includin self-alimng bearings for-su portthe ower rail on the frame, and c amping bolts extendin through the bearings and connecting the en portions of the lower rail 5 `and the frame.

2. In a typewriter, the combination with a main frame ofmeans for supporting a carriage on said frame for letter space movements including upper and lower rails, and

means including iloating bearing blocks disposed between and directly engaging the ends of the lower rail and the frame.

3. In a typewriter, the combination with a main frame including side plates having inwardly extending lugs, of means for supporting a carriage on said frame including up r and lower rails, the lower rail being provi ed with transverse bearing recesses adjacent its ends, and floating bearing blocks slidably supported directly on thev lugs and directly engageable withl the bearing surfaces of the recesses of the lower rail.

4. In a, typewriter, the combination with a main frame including side plates having inwardly extending lugs, of means for supporting a carriage on said frame including upper and lower rails, the lower rail being provided with transverse ,bearing recesses adjacent its ends floating bearing blocks slidably supported directly on the lugs and directly engageable with the bearing surfaces of the recesses ofthe lower rail, and clamping boltsconnecting the end portions of the lower rail and the frame.

5. In a typewriter, the combination with a main frame including -side plates having inwardly extending lugs, of means for supporting a carriage on said frame including upper and lower rails, the lower rail being provided with transverse bearing recesses adjacent its ends, each recess including upwardly converging flat walls, and floating bearing blocks slidably supported directly on the lugs and including transversely rounded upper surfaces directly engageable with the converging flat walls of the blocks.

6. In a typewriter, the combination with a main frame including sideplates having inwardly extending lugs, of means for supporting a carriage on said frame including upper and lower rails, the lower rail being provided with transverse bearing` recesses adjacent its ends, each recess includin upwardl conver ing side walls, floating aring b ocks slidably supported on the lugs and including transversely rounded upper surfaces engageable with the converging side walls of the blocks, said lugs and blocks being provided with alined openings, and a clamping bolt extending through the alined openings of the lugs and blocks and engageable with the lower rail, the diameter of each opening in each lug being greater than the diameter of the associated bolt shank. j

7. In a typewriter, the combination with a main frame, of means for supporting a carriage on said frame for letter space movements including upper and lower rails, means including self-alining bearings for supporting the lower rail on the frame, clamping bolts extending through the bearings and connecting the end `portions of the lower rail and the frame, and means for l1ndepenlently and positively adjusting the Ill l 55 the frame for retaining said ends of the lower' rail ina fore and aft direction relative tothe main frame.

8. In a typewriter the combination with a main frame inclu ing side plates having i inwardly extending lugs, of means for supporting a carriage on said frame including upper and lower rails, the lower rail being provided with transverse bearing recesses adjacent its ends floating bearing blocks slidably supported directly on the ugs and engageable 1n the bearing recesses of the lower rail, and means for independently and positively adjusting the ends of the lower rail in a fore and aft direction relative to the main frame. Y

9. In a typewriter, the combination with a main frame includingside plates having inwardly extending lugs, of means for supporting a carriage on said frame including upper and lower rails, the lower rail being provided with transverse bearing recesses adjacent its ends, floatin bearing'blocks slidably su ported on the and engageable in the bearing recesses o the lower rail,

25 and means for .independentl adjusting tile ends of the lower rail in a ore and a porting a carriage on said frame including upper and lower rails', the' lower rail being provided with transverse bearing adjacent its ends floating bearing blocks slidably s ported on the ugs .and engageable in the' ating 'of the lower rail, means for independently adjusting the ends of the lower ra1l in a fore and aft direction relative to the main frame, and means connecting the lower rail and the side plates of the frame for retaining said plates against lateral movement relative to the rail in any position of adjustment of the latter, said oonnecting means comprising' transverse ooves located in the end portions of thevower rail and means secured to the side plates and projectingI upwardly into Vsaid grooves.A

In testimony whereof, I -have hereunto subscribed my name.

HENRY J. HART.

rection relative to the main frame, comprisinga slot formed in each lug, and a screw threadably engaged with the associated end of the lower railv and having its head seated in said slot.

10. In a typewriter, the combination with a main frame of means for supporting a carriage on said frame for letterspace movements including up means including se -alining bea for supporting the lower rail on the me, means for independently adjusting the ends of the lower rail in a fore and aft direction r and lower rails,

40 relative to the main frame, and means connecting the lower rail and the side plates of the frame for retainin said latesagm lateral movement relative to t e rail 1n an position of adjustment of the latter.

11. In a typewriter, the combination with a main frame, of means for supporting a carriage on said frame for letter space move ments including upper and lower rails,' I

means including se alining bearin supporting the lower rail' on' the me, means for independently adjusting theends of the lower rail in a fore and aft relativeto the main frame, and means oonnecting the lower rail and the side plates of for lateral movement relative to necting means compri .plates 'van projecting upwardly into said grooves. 1

12. In a typewriter, the' combination with a main frame including side plates having tplates Y j e rail in any` position of adjustment of the latter, said conf V transverse ves' located in the end portions of the 00 over raild and means secured to the side Vim:

noy 

